When the manufacturer says the RIFLE will shoot MOA all day long, they don't mean in any shooters hands. They mean from a lead sled or at least a competent shooter.
They don't mean with WWB, they mean with Hornady match ammunition.

There are a whole lot of rifles designs being produced that will shoot sub MOA 3 shot groups at a very high repeatability from a rest. That is the one measure I give modern production an edge over older production. Good thing shooting subMOA isn;t high on the list for me with most rifles. Rests are too heavy to carry in the woods anyways.